Asynchronous motor.



T. L. LEE. ASYNOHRONOUS MOTOR.

APIILIGATION FILED NOV. 9, 1912.

v Patented Oct. 13, 1914.

INVENTOR.

A; A TT'ORNE YJ I VITNESSES:

UNITED STATES PATENT ormon.

THOMAS L. LEE, 0F \VESTFIELD, NEW JERSEY, ASSIGNOR T0 HALL SWITCH &SIGNAL COMPANY, A CORPORATION OF MAINE.

ASYNCHRONOUS MOTOR.

Specification of Letters Patent.

1... .nted Oct. 13,1914.

Application filed November 9, 1912. Serial N 0. 730,304.

To all whom it may concern: v

Be it known that I, THoMAsL. LEE, a citizen of the United States, and aresident of \Vestfield, Union county, State of New Jersey, have inventedcertain new and 'useful Improvements in Asynchronous Motors, of whichthe following is a specification. L

My invention relates to improvements in motors, and more particularly tothat class of motors known as, asynchronous motors and machines whichare particularly adapted to act as relays where accessibility andcompactness of parts, certainty of operation, and simplicity, areimportant considerations.

One object of my invention is to provide a motor which is extremelysimple in arrangement, which ma be easily taken apart for repairs orremova of parts, and in which the'moving parts are extremely light andefficient.

will more clearly appear from the detailed description given below,taken in connection with the accompanying drawings which form a part ofthis specification.

In the drawings, Figure 1 is a side view of parts of a motor embodyingmy improvements in one form, one frame-piece and the armature of themotor being removed for the sake of clearness; Fig. 2 1s a transversesection of the motor; Fig. 3 is a perspective view of the cup-shapedarmature; and Fig. 4 is a detail showing the connection of leads to themotor.

Referring to the various fi res, 1 represents a frame-piece having atits base flanges 2 by means of which the motor may be suitably securedin place. The frame-piece is centrally screw-threaded at 3 and removablyattached thereto, by means of cooperating screw-threads, is a centralstud 4. Arranged on the stud 4 is a sleeve 5 about which are assembledlaminations 6 forming the inner inductor member or field magnet. At eachside of the laminations 6 there are placed insulatin sheets 7', whoseshape corresponds to that of the laminated pieces 6. The laminations 6and pieces 7 are held upon the sleeve 5 and the central stud 4 by meansof a washer 8 and nut 9 screw-threaded upon the inner end of the stud 4.Also secured to the frame-piece 1 is an outer inductor member 10composed of thin rings or laminations circular in form,-with suitableend pieces 11. The laminations 5 and 10 are of soft magneticiron.

Rctatin between the outer inductor member com osed of 'laminations l0,and the inner in uctor member composed of laminatlons 6, etc., is acup-shaped armature 12 made of conducting material, such as copper. Thecup-shaped armature 12 is secured to a shaft 13 by means ofmembers 14and 15 and rivets 16. The stud 4 is recessed at its mner end at 17 andthe shaft 13 projects through this recessed, portion and has-itsbearings or is journaled in the stud 4 at 18, about midway between theends of the stud 4.- At its opposite end the shaft'13 is journaled inabearin 19 situated in a framepiece 20. The f rame-piece 20 is screw--it is removably secured thereto.

Field windings 22 may be wound upon the inner inductor member, as shownin Fig. 1. These field windings are adapted to carry alternating currentin order to produce a suitable shifting field whereby the armature 12 iscaused to rotate. In the present instance, the field is produced bymeans of current introduced by means of the four leads'23, 24., 25 and26.

On the outer end of the shaft 13 is provided a gear 27 which may be usedto operate the switch mechanism of a relay, or any other suitable ordesired mechanism.

The operation of such motors is well understood by those skilled in theart. It will, therefore, only be necassary to point out that in order toget the maximum torque in a motor of this class, for its size, I haveconstructed the armature of a thin cup of copper and placed all theexciting windings of the machine on the inductor member inside thearmature, so that the diameter of the armature is made relatively largerto increase the torque without necessarily increasing the size of themachine. Since the outer inductor member or iron at 10 is carried by thefield frame 1, the moving parts are made extremely light and efficient.Moreover, by having the inner inductor member or laminations 6. carriedupon the central stud 4, which is removable from the frame 1, the fieldmagnet may easily be removed from the frame for repair or removal ofparts. In order to take the motorapart, it is only necessary to unscrewthe frame 20 from the frame 1, which operation also removes the armaturel2, and then unscrew the stud 4 from the frame 1, whereupon the fieldmagnet is entirely removed. The armature 12 and its shaft 13 may beremoved from the frame 20 by loosening gear 27 Although I have describedmy improvements in great detail and with respect to one particularembodiment thereof, nevertheless,

it will be obvious that various changes and modifications may be madewithout departing from the spirit and scope of-my invention in itsbroader aspects, and I therefore do not desire to be limited to thedetails shown and described, except as clearly pointed out in theappended claims.

Having fully and clearly described my invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A motor comprising a frame piece, a

u central stud screw threaded thereto and car- 2. A. motor comprising aframe piece, a central stud removably attached to said frame piece andcarrying an inner fixed inductor member having alternating current fieldwindings, an outer fixed inductor member, a second frame piece removablyattached to the first frame piece, one of said frame piecessubstantially encircling the magnetic parts of the motor, a shaftjournaled in said stud-and said second frame piece, and a cup shapedarmature of conducting material secured to said shaftvand rotatablebetween said inductor members.

3. A motor comprising a frame piece substantially encircling themagnetic parts of the motor, a stud removably attached to said framepiece, and carrying an inner fixed inductor member having alternatingcurrent field windings, a second frame piece removably attached to thefirst frame piece, a shaft journaled in said stud and said second framepiece, and a cup shaped armature of conducting material secured to saidshaft a:

123nd rotatable between said inductor niemers.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

THOMAS L. LEE.

Witnesses:

D. GURNEE, E. A. HALBLEIB.

